yes I did model an interior in 3dmax 2015 in mm and when I finish wit everything I did change system unit setup to cm, and I believe that if you do that its going to be ok,but when I did open it in unreal 4.9 everything is big the light are so small and the character (you) are sooo small like ant small hehe ,so what should I do next time model every thing in cm in max and export it like that?